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Somewhat better Perl :-(

    1: <problem>
    2: <script type="loncapa/perl">
    3: sub fact {
    4:    my $n=shift;
    5:    if ($n==1) {
    6:       return $n;
    7:    } else {
    8:       return $n*&fact($n-1);
    9:    }
   10: }
   11: 
   12: $testvalues='0=1';
   13: foreach $i (1..3) {
   14:    $rand=&random(3,8,1);
   15:    $testvalues.=','.$rand.'='.&fact($rand);
   16: }
   17: </script>
   18: 
   19: 
   20: <startouttext />Write a Perl subroutine called <tt>factorial</tt>, which returns the factorial of its argument, e.g. <tt>&amp;factorial(17)=17!</tt>.
   21: <instructorcomment>
   22: Sample code for an evaluation script can be found <a href="/res/adm/includes/templates/sampleexternal.pl">here.</a></instructorcomment>
   23: <endouttext />
   24: <externalresponse url="http://localhost/cgi-bin/sampleexternal.pl" answer="$testvalues">
   25: <textfield />
   26: 
   27: </externalresponse>
   28: </problem>